Effect of redispersible vinyl acetate and versatate copolymer powder on flexibility of cement mortar

• Published in: Construction & building materials 2012-02, Vol.27 (1), p.259-262
• Main Authors: Wang, Ru, Wang, Pei-Ming, Yao, Li-Juan
• Format: Article
• Language: English
• Subjects: Analysis; Cement mortar; Deformations (Mechanics); Flexibility; Fracture energy; Mortar; Production processes; Properties; Ratio of compressive strength to flexural strength; Redispersible VA/VeoVa powder; Transverse deformation; Vinyl acetate
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2011.07.050

► VA/VeoVa powder increases the transverse deformation and fracture energy of mortar. ► VA/VeoVa powder increases the flexural strength markedly. ► The σ C/ σ F of mortar was effectively reduced by VA/VeoVa powder. ► VA/VeoVa powder improves the flexibility of cement mortar significantly. ► Transverse deformation and σ C/ σ F are complementary in charactering the flexibility. The effect of redispersible vinyl acetate and versatate copolymer (VA/VeoVa) powder on the flexibility of cement mortar is studied using the methods of the transverse deformation and the ratio of compressive strength to flexural strength ( σ C/ σ F), to explore the possibility of these two methods in charactering the flexibility of VA/VeoVa powder-modified mortar. The transverse deformation and the fracture energy of the modified mortar increase significantly with the augment of the m p/ m c, but the peak load decreases when the m p/ m c is higher than 8%. 3% m p/ m c makes the compressive strength decrease, but has no effect on the flexural strength; whereas when the m p/ m c is higher than 5%, the VA/VeoVa powder increases the flexural strength markedly. The σ C/ σ F depresses sharply with the m p/ m c augmenting from 0% to 3%. The transverse deformation and the σ C/ σ F are complementary to each other in charactering the flexibility of VA/VeoVa powder-modified mortar. VA/VeoVa powder improves the flexibility of cement mortar significantly.